Acronym	Definition
AADT	Annual Average Daily Traffic
AADTT	Annual Average Daily Truck Traffic
ADT	Average Daily Traffic
ATR	Automatic Traffic Recorder
AVMT	Annual Vehicle Miles Traveled (of Traffic)
CCS	Continuous Count Station
Corridor Route	MDT route naming convention (ex: C000005)
Count Site ID	County, Mapsheet, Station ID (ex: 25-7B-20)
Departmental Route	MDT route naming convention (ex: N-5)
DHV	Design Hour Volume = K * ADT (usually 30th highest hour)
DVMT	Daily Vehicle Miles Traveled (of Traffic)
ESAL	Equivalent Single-Axle Load
MADT	Monthly Average Daily Travel
MPO	Metropolitan Planning Organization
NHS	National Highway System
NI-NHS	Non-Interstate National Highway System
Off System routes	All routes that are not on system. This includes State Highway (X-routes) and Locals (L-routes)
On System routes	Route categories that are classified as On System (Interstate, Non-interstate NHS, Primary, Secondary, Urban)
PWIM	Portable Weigh In Motion
RP	Reference Post (Mile Post)
TBS	Traffic By Sections
TDC	Traffic Data Collection
TDCA	Traffic Data Collection and Analysis Section
TMG	Traffic Monitoring Guide
TYC	Traffic Yearly Counts
VMT	Vehicle Miles Traveled (of Traffic)
WIM	Weigh In Motion (an ATR that weighs vehicles)